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   &#160;<span id="projectnumber">Version 1.03</span>
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<div class="title">Revision History </div>  </div>
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<div class="textblock"><h1><a class="anchor" id="GenRTOSRev"></a>
CMSIS-RTOS API</h1>
<table  class="cmtable" summary="Revision History">
<tr>
<th>Version </th><th>Description  </th></tr>
<tr>
<td>V1.03 - only documentation changes </td><td>Incorporated documentation for reference implementation CMSIS-RTOS RTX.   </td></tr>
<tr>
<td>V1.02 - only documentation changes </td><td>Added: Overview of the <a class="el" href="rtosValidation.html">CMSIS-RTOS Validation</a> Software Pack.<br/>
 Clarified: Behaviour of <a class="el" href="functionOverview.html#CMSIS_RTOS_TimeOutValue">Timout Value</a>.   </td></tr>
<tr>
<td>V1.02 </td><td>Added: New control functions for short timeouts in microsecond resolution <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gad0262e4688e95d1e9038afd9bcc16001">osKernelSysTick</a>, <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga9e0954d52722673e2031233a2ab99960">osKernelSysTickFrequency</a>, <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae12c190af42d7310d8006d64f4ed5a88">osKernelSysTickMicroSec</a>.<br/>
 Removed: osSignalGet.   </td></tr>
<tr>
<td>V1.01 </td><td>Added capabilities for C++, kernel initialization and object deletion.<br/>
 Prepared for C++ class interface. In this context to <em>const</em> attribute has been moved from osXxxxDef_t typedefs to the osXxxxDef macros.<br/>
 Added: <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga746b8043d906849bd65e3900fcb483cf">osTimerDelete</a>, <a class="el" href="group__CMSIS__RTOS__MutexMgmt.html#gac27e24135185d51d18f3dabc20910219">osMutexDelete</a>, <a class="el" href="group__CMSIS__RTOS__SemaphoreMgmt.html#gabae2801ac2c096f6e8c69a264908f595">osSemaphoreDelete</a>.<br/>
 Added: <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga53d078a801022e202e8115c083ece68e">osKernelInitialize</a> that prepares the Kernel for object creation.<br/>
   </td></tr>
<tr>
<td>V1.00 </td><td>First official Release.<br/>
 Added: <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaab668ffd2ea76bb0a77ab0ab385eaef2">osKernelStart</a>; starting 'main' as a thread is now an optional feature.<br/>
 Semaphores have now the standard behavior.<br/>
 <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> does no longer start the timer. Added: <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a> (replaces osTimerRestart).<br/>
 Changed: osThreadPass is renamed to <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#gaf13a667493c5d629a90c13e113b99233">osThreadYield</a>.   </td></tr>
<tr>
<td>V0.02 </td><td>Preview Release.  </td></tr>
</table>
<h1><a class="anchor" id="RTXRevisionHistory"></a>
CMSIS-RTOS RTX</h1>
<table  class="cmtable" summary="Revision History">
<tr>
<th>Version </th><th>Description  </th></tr>
<tr>
<td>V4.82 </td><td>Corrected: Recursive Mutex 16-bit lock counter is now checked to not overflow.<br/>
   </td></tr>
<tr>
<td>V4.81 </td><td>Added provisions for Arm Compiler 6.<br/>
 Corrected: Message Queue behavior when osMessagePut timed out due to full queue and osMessageGet was called from ISR.<br/>
   </td></tr>
<tr>
<td>V4.80 </td><td>Restored time delay parameter 'millisec' old behavior (before V4.79) for software compatibility.<br/>
 Corrected: implicit mutex release when mutex owner thread is terminated.<br/>
   </td></tr>
<tr>
<td>V4.79 </td><td>Corrected: time delay parameter ‘millisec’ in all functions (osDelay, osSignalWait, …) is now treated as lower bound – wait for at least time given (before it could have been up to 1ms less).<br/>
 Corrected: Lazy Context switching for Cortex-M4 with FPU could lead to a crash when thread which used FPU was terminated.<br/>
 Corrected: osMailCAlloc only cleared the allocated memory block if it was available without waiting.<br/>
 Corrected: osThreadCreate function returns NULL when trying to create more concurrent threads than defined in the configuration.<br/>
 Improved source code MISRA compliance.<br/>
   </td></tr>
<tr>
<td>V4.78 </td><td>Corrected: osTimerStart function accepts full 32-bit range for time delay value in milisec.<br/>
 Added: User Timer Callback Queue overflow reported through os_error(OS_ERROR_TIMER_OVF).<br/>
   </td></tr>
<tr>
<td>V4.77 </td><td>Added: Stack usage watermark.<br/>
   </td></tr>
<tr>
<td>V4.76 </td><td>Optimized Service calls in GCC libraries.<br/>
 Corrected: Stack/Heap regions can be used with scatter loading.<br/>
   </td></tr>
<tr>
<td>V4.75 </td><td>Corrected: Service calls for Cortex-M4 with Floating Point for GCC.<br/>
 Corrected: <a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga87283a6ebc31ce9ed42baf3ea7e4eab6">osSignalClear</a> returns 0x80000000 when called from interrupt service routines.<br/>
 Corrected: C standard library memory functions (malloc, free, ...) can be called between calls to <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga53d078a801022e202e8115c083ece68e">osKernelInitialize</a> and <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaab668ffd2ea76bb0a77ab0ab385eaef2">osKernelStart</a>.<br/>
 Corrected: Interrupt Priority Group can be configured between calls to <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga53d078a801022e202e8115c083ece68e">osKernelInitialize</a> and <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaab668ffd2ea76bb0a77ab0ab385eaef2">osKernelStart</a>.<br/>
   </td></tr>
<tr>
<td>V4.74 </td><td>Corrected: <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga53d078a801022e202e8115c083ece68e">osKernelInitialize</a> and <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaab668ffd2ea76bb0a77ab0ab385eaef2">osKernelStart</a> when called from main which is already a thread.<br/>
   </td></tr>
<tr>
<td>V4.73 </td><td>Corrected: mutex priority inversion when thread owns more than one mutex.<br/>
 Added: RTX extensions os_suspend and os_resume.<br/>
 Added: RTX os_error template.   </td></tr>
<tr>
<td>V4.72 </td><td>Corrected: object initialization when defined inside function (allocated on stack and not as static memory).  </td></tr>
<tr>
<td>V4.71 </td><td>Corrected: osMailFree behaviour when osMailAlloc timed out.  </td></tr>
<tr>
<td>V4.70 </td><td>Added: New control functions for short timeouts in microsecond resolution <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gad0262e4688e95d1e9038afd9bcc16001">osKernelSysTick</a>, <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga9e0954d52722673e2031233a2ab99960">osKernelSysTickFrequency</a>, <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae12c190af42d7310d8006d64f4ed5a88">osKernelSysTickMicroSec</a>.<br/>
 Removed: osSignalGet.   </td></tr>
<tr>
<td>V4.61 </td><td>Enhanced: <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> can now be called after <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga53d078a801022e202e8115c083ece68e">osKernelInitialize</a> (before only after <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaab668ffd2ea76bb0a77ab0ab385eaef2">osKernelStart</a>).<br/>
 Corrected: Initialization of alternative kernel timer for Cortex-M0/M0+/M1 (when SysTick timer is not used).<br/>
 Corrected: Message/Mail Queue behavior when timeout expires.   </td></tr>
<tr>
<td>V4.51 </td><td>Corrected: problem with <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga53d078a801022e202e8115c083ece68e">osKernelInitialize</a> when after the call high priority threads are defined.  </td></tr>
<tr>
<td>V4.50 </td><td>Based on CMSIS-RTOS API Version 1.01 and the classic RTX V4.50 Kernel.<br/>
 Added: <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga746b8043d906849bd65e3900fcb483cf">osTimerDelete</a>, <a class="el" href="group__CMSIS__RTOS__MutexMgmt.html#gac27e24135185d51d18f3dabc20910219">osMutexDelete</a>, <a class="el" href="group__CMSIS__RTOS__SemaphoreMgmt.html#gabae2801ac2c096f6e8c69a264908f595">osSemaphoreDelete</a>.<br/>
 Added: <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga53d078a801022e202e8115c083ece68e">osKernelInitialize</a> that prepares the Kernel for object creation.<br/>
 Added: support for Low Power Cortex-M applications based on new configuration functions: <b>os_suspend</b>, <b>os_resume</b>.<br/>
 Added: support for peripheral timer to be used as OS tick timer instead of Core SysTick timer.<br/>
 Corrected: stack checking did not work for os_tsk_delete_self function Preview Release.   </td></tr>
<tr>
<td>V4.20 </td><td>Initial CMSIS-RTOS adaption of the RTX Kernel.   </td></tr>
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